Vol. 10, Issue 11 (2021)

Author(s):
A Vedasree, K Kalpana, S Thiruvudainambi, S Vellaikumar, S Harish and M Theradimani

Abstract:
Cluster bean (guar) scientifically called as Cyamopsis tetragonoloba (L.) Taub. belongs to the family Leguminosae. Cluster bean mosaic disease caused by bean common mosaic virus belongs to the family Potyviridae is one of the major viral diseases which affects the yield of cluster beans. A roving survey was conducted in major cluster bean growing areas of Madurai and Coimbatore. The potyvirus disease incidence ranged from 26 to76 percent. Maximimum per cent disease incidence was observed in the fields of cluster beans grown in the orchard of Agricultural College and Research Institute, Madurai i.e., (76 per cent) and the least (26 per cent) in the fields of Periyailanthaikulam village of Madurai district. In plants infected with Potyvirus, symptoms like downward curling, mosaic patches, vein necrosis were observed. Infected plants had produced minimum numbers of flowers and pods, pods were thin with immature and discoloured seeds.